单项选择题

As physical exercise declines and diet expands, ______.

A．other western countries has been defeated by fat
B．obesity has become an epidemic (流行病) of the rich world
C．waistbands begin to be popular in other western countries
D．western countries can no longer fight against obesity
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单项选择题
The DNA in the sperm cells can be measured ______.
A．in the same way how the cattle are herded
B．when they pass through a tube one behind the other
C．after they pass through a laser tube
D．when they are scanned by a laser detector all at a time
单项选择题
The first sentence of the passage most probably implies that ______.
A．many Americans are obsessed with the rising temperature in their bathroom
B．more people are overweighed in the United States
C．people are doing more physical exercises with the help of scales
D．youngsters become taller and healthier thanks to more activities
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